TL;DR
This paper presents FRICAT, a comprehensive catalog of 219 FRI radio galaxies, revealing that the well-studied 3C-FRIs are just a small, biased subset of a much larger and diverse population.
Contribution
The paper introduces FRICAT, the first extensive catalog of FRI radio galaxies, including detailed optical and radio properties, expanding understanding of their diversity and relation to known samples.
Findings
FRICAT sources are all low excitation, red early-type galaxies.
3C-FRIs are a biased subset; most FRIs show different radio and line luminosity relations.
FRICAT reveals a larger, more diverse population of FRI radio galaxies.
Abstract
We built a catalog of 219 FRI radio galaxies (FRIs), called FRICAT, selected from a published sample and obtained by combining observations from the NVSS, FIRST, and SDSS surveys. We included in the catalog the sources with an edge-darkened radio morphology, redshift , and extending (at the sensitivity of the FIRST images) to a radius larger than 30 kpc from the center of the host. We also selected an additional sample (sFRICAT) of 14 smaller (10 30 kpc) FRIs, limiting to . The hosts of the FRICAT sources are all luminous (), red early-type galaxies with black hole masses in the range ; the spectroscopic classification based on the optical emission line ratios indicates that they are all low excitation galaxies. Sources in the FRICAT are then indistinguishable from the FRIs…
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